著者

竹村 洸亮 安田 啓司 朝倉 義幸

出版者

日本ソノケミストリー学会

雑誌

ソノケミストリー討論会講演論文集 (ISSN:24241512)

巻号頁・発行日

pp.41-42, 2016 (Released:2017-07-21)

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Ethanol and organic material mixed aqueous solution were atomized using ultrasonic irradiation at 2.4 MHz. Atomized liquid was collected by refrigeration of liquid nitrogen. The concentrations in collected liquid and mist were experimentally investigated. Malic acid, lactic acid (organic acid), 1-propanol, methanol (alcohol), methyl ethyl ketone, diethyl ketone (ketone) were used as organic material. The ethanol concentration in collected liquid was little affected by addition of organic materials. Organic acid in ethanol aqueous solution was not separated. On the other hand, alcohol and ketone concentrations in collected liquid were higher than those in sample. The 1-propanol concentration in collected liquid was lower than that in mist. This is because it is difficult to collect nano-sized droplets which contain highly condensed alcohol.

著者

東海 旭宏 水越 克彰 興津 健二 堀 史説 西村 芳実 岩瀬 彰宏

出版者

日本ソノケミストリー学会

雑誌

ソノケミストリー討論会講演論文集 (ISSN:24241512)

巻号頁・発行日

pp.43-44, 2016 (Released:2017-07-21)

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We synthesized graphene-Pd nanocomposites in one-pot by ultrasound, radiation and liquid phase plasma. Graphene dispersion containing Pd ions and 2-propanol was irradiated with ultrasound (200 kHz, 200 W) for 30 min and with gamma-ray (̴1 MeV) and electron beam (̴6 MeV). In radiochemical synthesis, the absorbed dose was 10 kGy. In these processes, the reduction of Pd ions and oxidation of graphene occurred simultaneously in one-pot. In the liquid plasma method, Pd nanoparticles generated directly from the electrodes were deposited onto carbonyl modified graphene. Based on the results, the formation mechanism of the nanocomposites was discussed.

著者

田口 君彦 松岡 辰郎 香田 忍

出版者

日本ソノケミストリー学会

雑誌

ソノケミストリー討論会講演論文集

巻号頁・発行日

vol.15, pp.63-64, 2006

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The mechanism of ultrasonic degradation is still obscure, but it is well accepted that cavitation bubbles are mainly responsible for the degradation. The intense shear field generated by the collapse of the cavitation bubbles induces chain scission. Most of investigations on ultrasonic degradation have been carried out at low ultrasonic frequency around 20kHz. In this work, the ultrasonic degradation of methyl cellulose in aqueous solution was studied at two frequencies (20kHz and 500kHz) at the constant calorimetric power (20W) and temperature (25℃). The time variation of the average molecular weights and the molecular distribution were determined by Gel Permeation Chromatography (GPC). The mass average molecular weights (M_w) decreases with sonication time. The large lowering of M_w was observed at the frequency 500kHz. The degradation rate was suppressed by the addition of t-BuOH which act as a radical scavenger. The ultrasonic degradation rate coefficient k_d was estimated and compared with the results of other water-soluble polymers. The order of k_d value were PEO > Dextran 〓 Pullulan > MC. We will discuss on the frequency effects on the ultrasonic degradation.